Why this one needs a probe
Traceroute works by sending packets with a deliberately small TTL and reading the errors that come back. That needs raw socket access, which browsers do not have, so a real probe runs the command for you. If you want to practise reading traceroute output instead, the Hop Visualizer simulates it instantly and offline.
When you’d reach for this
When traffic reaches a destination slowly, or not at all, and you need to know where it stops. The hop where latency jumps, or where replies stop entirely, is the place to start asking questions.
Learn the idea behind the tool
This tool is the fast answer; the lesson is the understanding. Start with How routing decisions work.